Method for using molding

Abstract

There are disclosed a method for using a molding which comprises using a molding produced by thermoforming a sheet for thermoforming comprising a styrenic polymer having a high degree of syndiotactic configuration or a composition thereof in an atmosphere containing a chlorofluorohydrocarbon and also a method for using a molding which comprises using a molding produced by thermoforming a laminate comprising at least one surface layer of the above styrenic polymer or a composition thereof and an other layer of a thermoplastic resin or a composition thereof in an atmosphere the same as above-mentioned. The moldings to be employed in the present invention are excellent in chemical resistance, solvent resistance and resistance against CFC and HCFC, and the sheet for thermoforming and the laminate are useful as the starting raw materials for the aforesaid molding. According to the present invention, the moldings can be used without any problem as the inner liners of refrigerators (including internals inside door) in an atmosphere of chlorofluorohydrocarbon or in contact with heat-insulating material such as polyurethane foam, and the scrap resins at the time of molding can be recovered and readily reused.

What is claimed is: 
     
       1. A chlorofluorohydrocarbon- and chlorofluorocarbon-resistant molding, produced by thermoforming a sheet, wherein said sheet comprises a styrenic polymer having a syndiotacticity such that the proportion of racemic diad is at least 75%, a weight average molecular weight of at least 100,000, a crytallinity of 30% or less, and a thickness of 5 mm to 0.1 mm,   wherein said molding has a crystallinity of 15% or more.   
     
     
       2. A chlorofluorohydrocarbon- and chlorofluorocarbon-resistant molding produced by thermoforming a laminate comprising at least one styrenic polymer surface layer and at least one other layer comprising a thermoplastic resin, wherein said styrenic polymer has a syndiotacticity such that the proportion of the racemic diad is at least 75%, a crystallinity of 30% or less, said surface layer has a thickness of 5 mm to 0.1 mm, and   wherein said molding is a laminate comprising at least one surface styrenic polymer layer,   wherein said styrenic polymer has a syndiotacticity such that the proportion of racemic diad is at least 75% and a crytallinity of 15% or more.   
     
     
       3. The molding according to claim 2, wherein said styrenic polymer of said laminate has a weight average molecular weight of at least 100,000. 
     
     
       4. The molding according to claim 2, wherein the thermoplastic resin has a glass transition temperature which is no greater than the glass transition temperature of the styrenic polymer plus 120° C. 
     
     
       5. The molding according to claim 2, wherein the thermoplastic resin is at least one resin selected from the group consisting of a styrenic polymer having atactic configuration, styrenic polymer having isotactic configuration, acrylonitrile triol/butadiene/styrene resin and acrylonitrile/styrene resin. 
     
     
       6. A chlorofluorohydrocarbon- and chlorofluorocarbon-resistant refrigerator panel, produced by thermoforming a sheet, wherein said sheet comprises a styrenic polymer having a syndiotacticity such that the proportion of racemic diad is at least 75%, a weight average molecular weight of at least 100,000, a crytallinity of 30% or less, and a thickness of 5 mm to 0.1 mm,   wherein said molding has a crystallinity of 15% or more.   
     
     
       7. The refrigerator panel according to claim 6, wherein the styrenic polymer is further comprised of a rubber or thermoplastic resin. 
     
     
       8. A chlorofluorohydrocarbon- and chlorofluorocarbon-resistant refrigerator panel, produced by thermoforming a laminate comprising at least one styrenic polymer surface layer and at least one other layer comprising a thermoplastic resin, wherein said styrenic polymer has a syndiotacticity such that the proportion of the racemic diad is at least 75%, a crystallinity of 30% or less, said surface layer has a thickness of 5 mm to 0.1 m, and   wherein said molding is a laminate comprising at least one surface styrenic polymer layer,   wherein said styrenic polymer has a syndiotacticity such that the proportion of racemic diad is at least 75% and a crytallinity of 15% or more.   
     
     
       9. The refrigerator panel according to claim 8, wherein the styrenic polymer is further comprised of a rubber or thermoplastic resin.